Replace digid_eherkenning_oidc_generics with library code #7727

Job	Run time
Build and check documentation	1m 21s
Check that documentation for configuration steps is up-to-date	1m 33s
Run the Django test suite (main)	19m 25s
End-to-end tests, chromium	3m 48s
Run the Django test suite (elastic)	5m 35s
End-to-end tests, firefox	4m 27s
Run the Django test suite (openklant)	1m 53s
End-to-end tests, webkit	4m 24s
End-to-end tests, msedge	4m 8s
Upload coverage information to codecov	18s
Build (and push) Docker image	1m 41s
	48m 33s

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